As of 1 January 2018, we switch to a fixed billing period for our bi-weekly invoices. The invoice for the first half of the month will be closed on the 15th of the month. The invoice for the second half of the month will be closed on the last day of the month.
The invoices themselves will be created in the days following the closing date. It is thus quite possible that the invoice will only be available on the Road User Portal between the 16th and the end of the month, although the billing period has been closed on January 15th.
For more information, please read our FAQ.